News for hackers. Stuff that matters.

A comment on Declining eyesight improved by looking at deep red light. Parent comment

Re:Declining eyesight improved by looking at deep red light by monkeycantype on Tuesday June 30, 2020 @02:56AM (#23687398)
So it looks like you need a bit more than a prism to see Fraunhofer lines, but there seem to be online description of how to do it with a with a prism and a CD, maybe you don't even need a prism, there seem to be 'make your own spectroscope' tutorials than mention building one with cereal box, and maybe a lens of some kind
[ Parent | on HN ]
Re:Declining eyesight improved by looking at deep red light by mrob on Tuesday June 30, 2020 @05:44AM (#23688364)
The D line is probably more easily seen in a colored flame made by adding salt water to an alcohol-burner flame:

https://en.wikipedia.org/wiki/Emission_spectrum#/media/File:...

[ Parent | on HN ]
Re:Declining eyesight improved by looking at deep red light by monkeycantype on Tuesday June 30, 2020 @06:58PM (#23695774)
that sounds like a project to do with my kids, thanks : )
[ Parent | on HN ]